A steady stream of endorsements for Obama hold Clinton at bay.

The Hillary Deathwatch

A steady stream of endorsements for Obama hold Clinton at bay.

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Superdelegates continue to trickle in for Barack Obama, and John Edwards says Clinton probably can't win. Polls continue to favor Clinton heavily in the next two primaries. But observers increasingly wonder, what's the point? Lacking inertia, Clinton dips two-tenths of a point to 2.1 percent.

Ever since Obama gained a solid lead in pledged delegates in the weeks after Super Tuesday, his supporters have leaked hints that he has won the private commitments of dozens of superdelegates, particularly in Congress. Every Wednesday morning after a primary, the media would await news of a major shift in superdelegate migratory patterns. It never came.

In an interview on the Today show, John Edwards was generally complimentary of Obama and optimistic about his odds of beating McCain in the fall, though he declined to actually endorse. Edwards' influence is diminished now that both Carolinas have voted, but he could still give Obama a bump in favorable media.

How her likely victories in these upcoming states will be received has a lot to do with whether the current trickle of superdelegates picks up. If one allows her a generous 65 percent of the vote in every remaining primary, Obama will still lead by 100 pledged delegates going into the convention. (You can test this yourself on our delegate calculator.) Such a result would mean he would need 358 superdelegates to win the nomination. DemConWatch estimates that he already has 263, meaning the high estimate for his magic number is below 100 and ticking down by the day.